vfs_syscalls.c revision 1.186
1 /* $NetBSD: vfs_syscalls.c,v 1.186 2003/04/20 07:06:33 yamt Exp $ */ 2 3 /* 4 * Copyright (c) 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * (c) UNIX System Laboratories, Inc. 7 * All or some portions of this file are derived from material licensed 8 * to the University of California by American Telephone and Telegraph 9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 10 * the permission of UNIX System Laboratories, Inc. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. All advertising materials mentioning features or use of this software 21 * must display the following acknowledgement: 22 * This product includes software developed by the University of 23 * California, Berkeley and its contributors. 24 * 4. Neither the name of the University nor the names of its contributors 25 * may be used to endorse or promote products derived from this software 26 * without specific prior written permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 31 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 38 * SUCH DAMAGE. 39 * 40 * @(#)vfs_syscalls.c 8.42 (Berkeley) 7/31/95 41 */ 42 43 #include <sys/cdefs.h> 44 __KERNEL_RCSID(0, "$NetBSD: vfs_syscalls.c,v 1.186 2003/04/20 07:06:33 yamt Exp $"); 45 46 #include "opt_compat_netbsd.h" 47 #include "opt_compat_43.h" 48 49 #include <sys/param.h> 50 #include <sys/systm.h> 51 #include <sys/namei.h> 52 #include <sys/filedesc.h> 53 #include <sys/kernel.h> 54 #include <sys/file.h> 55 #include <sys/stat.h> 56 #include <sys/vnode.h> 57 #include <sys/mount.h> 58 #include <sys/proc.h> 59 #include <sys/uio.h> 60 #include <sys/malloc.h> 61 #include <sys/dirent.h> 62 #include <sys/sysctl.h> 63 #include <sys/sa.h> 64 #include <sys/syscallargs.h> 65 66 #include <miscfs/genfs/genfs.h> 67 #include <miscfs/syncfs/syncfs.h> 68 69 MALLOC_DEFINE(M_MOUNT, "mount", "vfs mount struct"); 70 71 static int change_dir __P((struct nameidata *, struct proc *)); 72 static int change_flags __P((struct vnode *, u_long, struct proc *)); 73 static int change_mode __P((struct vnode *, int, struct proc *p)); 74 static int change_owner __P((struct vnode *, uid_t, gid_t, struct proc *, 75 int)); 76 static int change_utimes __P((struct vnode *vp, const struct timeval *, 77 struct proc *p)); 78 static int rename_files __P((const char *, const char *, struct proc *, int)); 79 static int dostatfs __P((struct mount *, struct statfs *, struct proc *, int, 80 int)); 81 82 void checkdirs __P((struct vnode *)); 83 84 int dovfsusermount = 0; 85 86 /* 87 * Virtual File System System Calls 88 */ 89 90 /* 91 * Mount a file system. 92 */ 93 94 #if defined(COMPAT_09) || defined(COMPAT_43) 95 /* 96 * This table is used to maintain compatibility with 4.3BSD 97 * and NetBSD 0.9 mount syscalls. Note, the order is important! 98 * 99 * Do not modify this table. It should only contain filesystems 100 * supported by NetBSD 0.9 and 4.3BSD. 101 */ 102 const char * const mountcompatnames[] = { 103 NULL, /* 0 = MOUNT_NONE */ 104 MOUNT_FFS, /* 1 = MOUNT_UFS */ 105 MOUNT_NFS, /* 2 */ 106 MOUNT_MFS, /* 3 */ 107 MOUNT_MSDOS, /* 4 */ 108 MOUNT_CD9660, /* 5 = MOUNT_ISOFS */ 109 MOUNT_FDESC, /* 6 */ 110 MOUNT_KERNFS, /* 7 */ 111 NULL, /* 8 = MOUNT_DEVFS */ 112 MOUNT_AFS, /* 9 */ 113 }; 114 const int nmountcompatnames = sizeof(mountcompatnames) / 115 sizeof(mountcompatnames[0]); 116 #endif /* COMPAT_09 || COMPAT_43 */ 117 118 /* ARGSUSED */ 119 int 120 sys_mount(l, v, retval) 121 struct lwp *l; 122 void *v; 123 register_t *retval; 124 { 125 struct sys_mount_args /* { 126 syscallarg(const char *) type; 127 syscallarg(const char *) path; 128 syscallarg(int) flags; 129 syscallarg(void *) data; 130 } */ *uap = v; 131 struct proc *p = l->l_proc; 132 struct vnode *vp; 133 struct mount *mp; 134 int error, flag = 0; 135 char fstypename[MFSNAMELEN]; 136 struct vattr va; 137 struct nameidata nd; 138 struct vfsops *vfs; 139 140 if (dovfsusermount == 0 && (SCARG(uap, flags) & MNT_GETARGS) == 0 && 141 (error = suser(p->p_ucred, &p->p_acflag))) 142 return (error); 143 /* 144 * Get vnode to be covered 145 */ 146 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, 147 SCARG(uap, path), p); 148 if ((error = namei(&nd)) != 0) 149 return (error); 150 vp = nd.ni_vp; 151 /* 152 * A lookup in VFS_MOUNT might result in an attempt to 153 * lock this vnode again, so make the lock recursive. 154 */ 155 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY | LK_SETRECURSE); 156 if (SCARG(uap, flags) & (MNT_UPDATE | MNT_GETARGS)) { 157 if ((vp->v_flag & VROOT) == 0) { 158 vput(vp); 159 return (EINVAL); 160 } 161 mp = vp->v_mount; 162 flag = mp->mnt_flag; 163 vfs = mp->mnt_op; 164 /* 165 * We only allow the filesystem to be reloaded if it 166 * is currently mounted read-only. 167 */ 168 if ((SCARG(uap, flags) & MNT_RELOAD) && 169 ((mp->mnt_flag & MNT_RDONLY) == 0)) { 170 vput(vp); 171 return (EOPNOTSUPP); /* Needs translation */ 172 } 173 /* 174 * In "highly secure" mode, don't let the caller do anything 175 * but downgrade a filesystem from read-write to read-only. 176 * (see also below; MNT_UPDATE or MNT_GETARGS is required.) 177 */ 178 if (securelevel >= 2 && 179 SCARG(uap, flags) != MNT_GETARGS && 180 SCARG(uap, flags) != 181 (mp->mnt_flag | MNT_RDONLY | 182 MNT_RELOAD | MNT_FORCE | MNT_UPDATE)) { 183 vput(vp); 184 return (EPERM); 185 } 186 mp->mnt_flag |= SCARG(uap, flags) & 187 (MNT_RELOAD | MNT_FORCE | MNT_UPDATE | MNT_GETARGS); 188 /* 189 * Only root, or the user that did the original mount is 190 * permitted to update it. 191 */ 192 if ((mp->mnt_flag & MNT_GETARGS) == 0 && 193 mp->mnt_stat.f_owner != p->p_ucred->cr_uid && 194 (error = suser(p->p_ucred, &p->p_acflag)) != 0) { 195 vput(vp); 196 return (error); 197 } 198 /* 199 * Do not allow NFS export by non-root users. For non-root 200 * users, silently enforce MNT_NOSUID and MNT_NODEV, and 201 * MNT_NOEXEC if mount point is already MNT_NOEXEC. 202 */ 203 if (p->p_ucred->cr_uid != 0) { 204 if (SCARG(uap, flags) & MNT_EXPORTED) { 205 vput(vp); 206 return (EPERM); 207 } 208 SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV; 209 if (flag & MNT_NOEXEC) 210 SCARG(uap, flags) |= MNT_NOEXEC; 211 } 212 if (vfs_busy(mp, LK_NOWAIT, 0)) { 213 vput(vp); 214 return (EPERM); 215 } 216 goto update; 217 } else { 218 if (securelevel >= 2) { 219 vput(vp); 220 return (EPERM); 221 } 222 } 223 /* 224 * If the user is not root, ensure that they own the directory 225 * onto which we are attempting to mount. 226 */ 227 if ((error = VOP_GETATTR(vp, &va, p->p_ucred, p)) != 0 || 228 (va.va_uid != p->p_ucred->cr_uid && 229 (error = suser(p->p_ucred, &p->p_acflag)) != 0)) { 230 vput(vp); 231 return (error); 232 } 233 /* 234 * Do not allow NFS export by non-root users. For non-root users, 235 * silently enforce MNT_NOSUID and MNT_NODEV, and MNT_NOEXEC if the 236 * mount point is already MNT_NOEXEC. 237 */ 238 if (p->p_ucred->cr_uid != 0) { 239 if (SCARG(uap, flags) & MNT_EXPORTED) { 240 vput(vp); 241 return (EPERM); 242 } 243 SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV; 244 if (vp->v_mount->mnt_flag & MNT_NOEXEC) 245 SCARG(uap, flags) |= MNT_NOEXEC; 246 } 247 if ((error = vinvalbuf(vp, V_SAVE, p->p_ucred, p, 0, 0)) != 0) 248 return (error); 249 if (vp->v_type != VDIR) { 250 vput(vp); 251 return (ENOTDIR); 252 } 253 error = copyinstr(SCARG(uap, type), fstypename, MFSNAMELEN, NULL); 254 if (error) { 255 #if defined(COMPAT_09) || defined(COMPAT_43) 256 /* 257 * Historically filesystem types were identified by number. 258 * If we get an integer for the filesystem type instead of a 259 * string, we check to see if it matches one of the historic 260 * filesystem types. 261 */ 262 u_long fsindex = (u_long)SCARG(uap, type); 263 if (fsindex >= nmountcompatnames || 264 mountcompatnames[fsindex] == NULL) { 265 vput(vp); 266 return (ENODEV); 267 } 268 strncpy(fstypename, mountcompatnames[fsindex], MFSNAMELEN); 269 #else 270 vput(vp); 271 return (error); 272 #endif 273 } 274 #ifdef COMPAT_10 275 /* Accept `ufs' as an alias for `ffs'. */ 276 if (!strncmp(fstypename, "ufs", MFSNAMELEN)) 277 strncpy(fstypename, "ffs", MFSNAMELEN); 278 #endif 279 if ((vfs = vfs_getopsbyname(fstypename)) == NULL) { 280 vput(vp); 281 return (ENODEV); 282 } 283 if (vp->v_mountedhere != NULL) { 284 vput(vp); 285 return (EBUSY); 286 } 287 288 /* 289 * Allocate and initialize the file system. 290 */ 291 mp = (struct mount *)malloc((u_long)sizeof(struct mount), 292 M_MOUNT, M_WAITOK); 293 memset((char *)mp, 0, (u_long)sizeof(struct mount)); 294 lockinit(&mp->mnt_lock, PVFS, "vfslock", 0, 0); 295 (void)vfs_busy(mp, LK_NOWAIT, 0); 296 mp->mnt_op = vfs; 297 vfs->vfs_refcount++; 298 mp->mnt_vnodecovered = vp; 299 mp->mnt_stat.f_owner = p->p_ucred->cr_uid; 300 mp->mnt_unmounter = NULL; 301 update: 302 /* 303 * Set the mount level flags. 304 */ 305 if (SCARG(uap, flags) & MNT_RDONLY) 306 mp->mnt_flag |= MNT_RDONLY; 307 else if (mp->mnt_flag & MNT_RDONLY) 308 mp->mnt_flag |= MNT_WANTRDWR; 309 mp->mnt_flag &=~ (MNT_NOSUID | MNT_NOEXEC | MNT_NODEV | 310 MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_NOCOREDUMP | 311 MNT_NOATIME | MNT_NODEVMTIME | MNT_SYMPERM | MNT_SOFTDEP); 312 mp->mnt_flag |= SCARG(uap, flags) & (MNT_NOSUID | MNT_NOEXEC | 313 MNT_NODEV | MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | 314 MNT_NOCOREDUMP | MNT_IGNORE | MNT_NOATIME | MNT_NODEVMTIME | 315 MNT_SYMPERM | MNT_SOFTDEP); 316 /* 317 * Mount the filesystem. 318 */ 319 error = VFS_MOUNT(mp, SCARG(uap, path), SCARG(uap, data), &nd, p); 320 if (mp->mnt_flag & (MNT_UPDATE | MNT_GETARGS)) { 321 if (mp->mnt_flag & MNT_WANTRDWR) 322 mp->mnt_flag &= ~MNT_RDONLY; 323 if (error || (mp->mnt_flag & MNT_GETARGS)) 324 mp->mnt_flag = flag; 325 mp->mnt_flag &=~ 326 (MNT_UPDATE | MNT_RELOAD | MNT_FORCE | MNT_WANTRDWR | 327 MNT_GETARGS); 328 if ((mp->mnt_flag & (MNT_RDONLY | MNT_ASYNC)) == 0) { 329 if (mp->mnt_syncer == NULL) 330 error = vfs_allocate_syncvnode(mp); 331 } else { 332 if (mp->mnt_syncer != NULL) 333 vfs_deallocate_syncvnode(mp); 334 } 335 vfs_unbusy(mp); 336 VOP_UNLOCK(vp, 0); 337 vrele(vp); 338 return (error); 339 } 340 /* 341 * Put the new filesystem on the mount list after root. 342 */ 343 cache_purge(vp); 344 if (!error) { 345 vp->v_mountedhere = mp; 346 simple_lock(&mountlist_slock); 347 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 348 simple_unlock(&mountlist_slock); 349 checkdirs(vp); 350 VOP_UNLOCK(vp, 0); 351 if ((mp->mnt_flag & (MNT_RDONLY | MNT_ASYNC)) == 0) 352 error = vfs_allocate_syncvnode(mp); 353 vfs_unbusy(mp); 354 (void) VFS_STATFS(mp, &mp->mnt_stat, p); 355 if ((error = VFS_START(mp, 0, p))) 356 vrele(vp); 357 } else { 358 vp->v_mountedhere = (struct mount *)0; 359 vfs->vfs_refcount--; 360 vfs_unbusy(mp); 361 free(mp, M_MOUNT); 362 vput(vp); 363 } 364 return (error); 365 } 366 367 /* 368 * Scan all active processes to see if any of them have a current 369 * or root directory onto which the new filesystem has just been 370 * mounted. If so, replace them with the new mount point. 371 */ 372 void 373 checkdirs(olddp) 374 struct vnode *olddp; 375 { 376 struct cwdinfo *cwdi; 377 struct vnode *newdp; 378 struct proc *p; 379 380 if (olddp->v_usecount == 1) 381 return; 382 if (VFS_ROOT(olddp->v_mountedhere, &newdp)) 383 panic("mount: lost mount"); 384 proclist_lock_read(); 385 LIST_FOREACH(p, &allproc, p_list) { 386 cwdi = p->p_cwdi; 387 if (cwdi->cwdi_cdir == olddp) { 388 vrele(cwdi->cwdi_cdir); 389 VREF(newdp); 390 cwdi->cwdi_cdir = newdp; 391 } 392 if (cwdi->cwdi_rdir == olddp) { 393 vrele(cwdi->cwdi_rdir); 394 VREF(newdp); 395 cwdi->cwdi_rdir = newdp; 396 } 397 } 398 proclist_unlock_read(); 399 if (rootvnode == olddp) { 400 vrele(rootvnode); 401 VREF(newdp); 402 rootvnode = newdp; 403 } 404 vput(newdp); 405 } 406 407 /* 408 * Unmount a file system. 409 * 410 * Note: unmount takes a path to the vnode mounted on as argument, 411 * not special file (as before). 412 */ 413 /* ARGSUSED */ 414 int 415 sys_unmount(l, v, retval) 416 struct lwp *l; 417 void *v; 418 register_t *retval; 419 { 420 struct sys_unmount_args /* { 421 syscallarg(const char *) path; 422 syscallarg(int) flags; 423 } */ *uap = v; 424 struct proc *p = l->l_proc; 425 struct vnode *vp; 426 struct mount *mp; 427 int error; 428 struct nameidata nd; 429 430 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 431 SCARG(uap, path), p); 432 if ((error = namei(&nd)) != 0) 433 return (error); 434 vp = nd.ni_vp; 435 mp = vp->v_mount; 436 437 /* 438 * Only root, or the user that did the original mount is 439 * permitted to unmount this filesystem. 440 */ 441 if ((mp->mnt_stat.f_owner != p->p_ucred->cr_uid) && 442 (error = suser(p->p_ucred, &p->p_acflag)) != 0) { 443 vput(vp); 444 return (error); 445 } 446 447 /* 448 * Don't allow unmounting the root file system. 449 */ 450 if (mp->mnt_flag & MNT_ROOTFS) { 451 vput(vp); 452 return (EINVAL); 453 } 454 455 /* 456 * Must be the root of the filesystem 457 */ 458 if ((vp->v_flag & VROOT) == 0) { 459 vput(vp); 460 return (EINVAL); 461 } 462 vput(vp); 463 464 /* 465 * XXX Freeze syncer. Must do this before locking the 466 * mount point. See dounmount() for details. 467 */ 468 lockmgr(&syncer_lock, LK_EXCLUSIVE, NULL); 469 470 if (vfs_busy(mp, 0, 0)) { 471 lockmgr(&syncer_lock, LK_RELEASE, NULL); 472 return (EBUSY); 473 } 474 475 return (dounmount(mp, SCARG(uap, flags), p)); 476 } 477 478 /* 479 * Do the actual file system unmount. File system is assumed to have been 480 * marked busy by the caller. 481 */ 482 int 483 dounmount(mp, flags, p) 484 struct mount *mp; 485 int flags; 486 struct proc *p; 487 { 488 struct vnode *coveredvp; 489 int error; 490 int async; 491 int used_syncer; 492 493 simple_lock(&mountlist_slock); 494 vfs_unbusy(mp); 495 used_syncer = (mp->mnt_syncer != NULL); 496 497 /* 498 * XXX Syncer must be frozen when we get here. This should really 499 * be done on a per-mountpoint basis, but especially the softdep 500 * code possibly called from the syncer doens't exactly work on a 501 * per-mountpoint basis, so the softdep code would become a maze 502 * of vfs_busy() calls. 503 * 504 * The caller of dounmount() must acquire syncer_lock because 505 * the syncer itself acquires locks in syncer_lock -> vfs_busy 506 * order, and we must preserve that order to avoid deadlock. 507 * 508 * So, if the file system did not use the syncer, now is 509 * the time to release the syncer_lock. 510 */ 511 if (used_syncer == 0) 512 lockmgr(&syncer_lock, LK_RELEASE, NULL); 513 514 mp->mnt_flag |= MNT_UNMOUNT; 515 mp->mnt_unmounter = p; 516 lockmgr(&mp->mnt_lock, LK_DRAIN | LK_INTERLOCK, &mountlist_slock); 517 if (mp->mnt_flag & MNT_EXPUBLIC) 518 vfs_setpublicfs(NULL, NULL, NULL); 519 async = mp->mnt_flag & MNT_ASYNC; 520 mp->mnt_flag &= ~MNT_ASYNC; 521 cache_purgevfs(mp); /* remove cache entries for this file sys */ 522 if (mp->mnt_syncer != NULL) 523 vfs_deallocate_syncvnode(mp); 524 if (((mp->mnt_flag & MNT_RDONLY) || 525 (error = VFS_SYNC(mp, MNT_WAIT, p->p_ucred, p)) == 0) || 526 (flags & MNT_FORCE)) 527 error = VFS_UNMOUNT(mp, flags, p); 528 simple_lock(&mountlist_slock); 529 if (error) { 530 if ((mp->mnt_flag & (MNT_RDONLY | MNT_ASYNC)) == 0) 531 (void) vfs_allocate_syncvnode(mp); 532 mp->mnt_flag &= ~MNT_UNMOUNT; 533 mp->mnt_unmounter = NULL; 534 mp->mnt_flag |= async; 535 lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK | LK_REENABLE, 536 &mountlist_slock); 537 if (used_syncer) 538 lockmgr(&syncer_lock, LK_RELEASE, NULL); 539 while (mp->mnt_wcnt > 0) { 540 wakeup(mp); 541 tsleep(&mp->mnt_wcnt, PVFS, "mntwcnt1", 0); 542 } 543 return (error); 544 } 545 CIRCLEQ_REMOVE(&mountlist, mp, mnt_list); 546 if ((coveredvp = mp->mnt_vnodecovered) != NULLVP) { 547 coveredvp->v_mountedhere = NULL; 548 vrele(coveredvp); 549 } 550 mp->mnt_op->vfs_refcount--; 551 if (LIST_FIRST(&mp->mnt_vnodelist) != NULL) 552 panic("unmount: dangling vnode"); 553 mp->mnt_flag |= MNT_GONE; 554 lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK, &mountlist_slock); 555 if (used_syncer) 556 lockmgr(&syncer_lock, LK_RELEASE, NULL); 557 while(mp->mnt_wcnt > 0) { 558 wakeup(mp); 559 tsleep(&mp->mnt_wcnt, PVFS, "mntwcnt2", 0); 560 } 561 free(mp, M_MOUNT); 562 return (0); 563 } 564 565 /* 566 * Sync each mounted filesystem. 567 */ 568 #ifdef DEBUG 569 int syncprt = 0; 570 struct ctldebug debug0 = { "syncprt", &syncprt }; 571 #endif 572 573 /* ARGSUSED */ 574 int 575 sys_sync(l, v, retval) 576 struct lwp *l; 577 void *v; 578 register_t *retval; 579 { 580 struct mount *mp, *nmp; 581 int asyncflag; 582 struct proc *p = l == NULL ? &proc0 : l->l_proc; 583 584 simple_lock(&mountlist_slock); 585 for (mp = mountlist.cqh_last; mp != (void *)&mountlist; mp = nmp) { 586 if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock)) { 587 nmp = mp->mnt_list.cqe_prev; 588 continue; 589 } 590 if ((mp->mnt_flag & MNT_RDONLY) == 0) { 591 asyncflag = mp->mnt_flag & MNT_ASYNC; 592 mp->mnt_flag &= ~MNT_ASYNC; 593 VFS_SYNC(mp, MNT_NOWAIT, p->p_ucred, p); 594 if (asyncflag) 595 mp->mnt_flag |= MNT_ASYNC; 596 } 597 simple_lock(&mountlist_slock); 598 nmp = mp->mnt_list.cqe_prev; 599 vfs_unbusy(mp); 600 601 } 602 simple_unlock(&mountlist_slock); 603 #ifdef DEBUG 604 if (syncprt) 605 vfs_bufstats(); 606 #endif /* DEBUG */ 607 return (0); 608 } 609 610 /* 611 * Change filesystem quotas. 612 */ 613 /* ARGSUSED */ 614 int 615 sys_quotactl(l, v, retval) 616 struct lwp *l; 617 void *v; 618 register_t *retval; 619 { 620 struct sys_quotactl_args /* { 621 syscallarg(const char *) path; 622 syscallarg(int) cmd; 623 syscallarg(int) uid; 624 syscallarg(caddr_t) arg; 625 } */ *uap = v; 626 struct proc *p = l->l_proc; 627 struct mount *mp; 628 int error; 629 struct nameidata nd; 630 631 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 632 if ((error = namei(&nd)) != 0) 633 return (error); 634 mp = nd.ni_vp->v_mount; 635 vrele(nd.ni_vp); 636 return (VFS_QUOTACTL(mp, SCARG(uap, cmd), SCARG(uap, uid), 637 SCARG(uap, arg), p)); 638 } 639 640 static int 641 dostatfs(struct mount *mp, struct statfs *sp, struct proc *p, int flags, 642 int root) 643 { 644 struct cwdinfo *cwdi = p->p_cwdi; 645 int error = 0; 646 647 /* 648 * If MNT_NOWAIT or MNT_LAZY is specified, do not 649 * refresh the fsstat cache. MNT_WAIT or MNT_LAXY 650 * overrides MNT_NOWAIT. 651 */ 652 if (flags == MNT_NOWAIT || flags == MNT_LAZY || 653 (flags != MNT_WAIT && flags != 0)) { 654 memcpy(sp, &mp->mnt_stat, sizeof(*sp)); 655 goto done; 656 } 657 658 if ((error = VFS_STATFS(mp, sp, p)) != 0) { 659 return error; 660 } 661 662 if (cwdi->cwdi_rdir == NULL) 663 (void)memcpy(&mp->mnt_stat, sp, sizeof(mp->mnt_stat)); 664 done: 665 if (cwdi->cwdi_rdir != NULL) { 666 size_t len; 667 char *bp; 668 char *path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 669 if (!path) 670 return ENOMEM; 671 672 bp = path + MAXPATHLEN; 673 *--bp = '\0'; 674 error = getcwd_common(cwdi->cwdi_rdir, rootvnode, &bp, path, 675 MAXPATHLEN / 2, 0, p); 676 if (error) { 677 free(path, M_TEMP); 678 return error; 679 } 680 len = strlen(bp); 681 /* 682 * for mount points that are below our root, we can see 683 * them, so we fix up the pathname and return them. The 684 * rest we cannot see, so we don't allow viewing the 685 * data. 686 */ 687 if (strncmp(bp, sp->f_mntonname, len) == 0) { 688 strcpy(sp->f_mntonname, &sp->f_mntonname[len]); 689 if (sp->f_mntonname[0] == '\0') 690 (void)strcpy(sp->f_mntonname, "/"); 691 } else { 692 if (root) 693 (void)strcpy(sp->f_mntonname, "/"); 694 else 695 error = EPERM; 696 } 697 free(path, M_TEMP); 698 } 699 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 700 sp->f_oflags = sp->f_flags & 0xffff; 701 return error; 702 } 703 704 /* 705 * Get filesystem statistics. 706 */ 707 /* ARGSUSED */ 708 int 709 sys_statfs(l, v, retval) 710 struct lwp *l; 711 void *v; 712 register_t *retval; 713 { 714 struct sys_statfs_args /* { 715 syscallarg(const char *) path; 716 syscallarg(struct statfs *) buf; 717 } */ *uap = v; 718 struct proc *p = l->l_proc; 719 struct mount *mp; 720 struct statfs sbuf; 721 int error; 722 struct nameidata nd; 723 724 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 725 if ((error = namei(&nd)) != 0) 726 return error; 727 mp = nd.ni_vp->v_mount; 728 vrele(nd.ni_vp); 729 if ((error = dostatfs(mp, &sbuf, p, 0, 1)) != 0) 730 return error; 731 return copyout(&sbuf, SCARG(uap, buf), sizeof(sbuf)); 732 } 733 734 /* 735 * Get filesystem statistics. 736 */ 737 /* ARGSUSED */ 738 int 739 sys_fstatfs(l, v, retval) 740 struct lwp *l; 741 void *v; 742 register_t *retval; 743 { 744 struct sys_fstatfs_args /* { 745 syscallarg(int) fd; 746 syscallarg(struct statfs *) buf; 747 } */ *uap = v; 748 struct proc *p = l->l_proc; 749 struct file *fp; 750 struct mount *mp; 751 struct statfs sbuf; 752 int error; 753 754 /* getvnode() will use the descriptor for us */ 755 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 756 return (error); 757 mp = ((struct vnode *)fp->f_data)->v_mount; 758 if ((error = dostatfs(mp, &sbuf, p, 0, 1)) != 0) 759 goto out; 760 error = copyout(&sbuf, SCARG(uap, buf), sizeof(sbuf)); 761 out: 762 FILE_UNUSE(fp, p); 763 return error; 764 } 765 766 767 /* 768 * Get statistics on all filesystems. 769 */ 770 int 771 sys_getfsstat(l, v, retval) 772 struct lwp *l; 773 void *v; 774 register_t *retval; 775 { 776 struct sys_getfsstat_args /* { 777 syscallarg(struct statfs *) buf; 778 syscallarg(long) bufsize; 779 syscallarg(int) flags; 780 } */ *uap = v; 781 int root = 0; 782 struct proc *p = l->l_proc; 783 struct mount *mp, *nmp; 784 struct statfs sbuf; 785 caddr_t sfsp; 786 long count, maxcount, error = 0; 787 788 maxcount = SCARG(uap, bufsize) / sizeof(struct statfs); 789 sfsp = (caddr_t)SCARG(uap, buf); 790 simple_lock(&mountlist_slock); 791 count = 0; 792 for (mp = CIRCLEQ_FIRST(&mountlist); mp != (void *)&mountlist; 793 mp = nmp) { 794 if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock)) { 795 nmp = CIRCLEQ_NEXT(mp, mnt_list); 796 continue; 797 } 798 if (sfsp && count < maxcount) { 799 error = dostatfs(mp, &sbuf, p, SCARG(uap, flags), 0); 800 if (error) { 801 simple_lock(&mountlist_slock); 802 nmp = CIRCLEQ_NEXT(mp, mnt_list); 803 vfs_unbusy(mp); 804 continue; 805 } 806 error = copyout(&sbuf, sfsp, sizeof(sbuf)); 807 if (error) { 808 vfs_unbusy(mp); 809 return (error); 810 } 811 sfsp += sizeof(sbuf); 812 root |= strcmp(sbuf.f_mntonname, "/") == 0; 813 } 814 count++; 815 simple_lock(&mountlist_slock); 816 nmp = CIRCLEQ_NEXT(mp, mnt_list); 817 vfs_unbusy(mp); 818 } 819 simple_unlock(&mountlist_slock); 820 if (root == 0 && p->p_cwdi->cwdi_rdir) { 821 /* 822 * fake a root entry 823 */ 824 if ((error = dostatfs(p->p_cwdi->cwdi_rdir->v_mount, &sbuf, p, 825 SCARG(uap, flags), 1)) != 0) 826 return error; 827 if (sfsp) 828 error = copyout(&sbuf, sfsp, sizeof(sbuf)); 829 count++; 830 } 831 if (sfsp && count > maxcount) 832 *retval = maxcount; 833 else 834 *retval = count; 835 return error; 836 } 837 838 /* 839 * Change current working directory to a given file descriptor. 840 */ 841 /* ARGSUSED */ 842 int 843 sys_fchdir(l, v, retval) 844 struct lwp *l; 845 void *v; 846 register_t *retval; 847 { 848 struct sys_fchdir_args /* { 849 syscallarg(int) fd; 850 } */ *uap = v; 851 struct proc *p = l->l_proc; 852 struct filedesc *fdp = p->p_fd; 853 struct cwdinfo *cwdi = p->p_cwdi; 854 struct vnode *vp, *tdp; 855 struct mount *mp; 856 struct file *fp; 857 int error; 858 859 /* getvnode() will use the descriptor for us */ 860 if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0) 861 return (error); 862 vp = (struct vnode *)fp->f_data; 863 864 VREF(vp); 865 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 866 if (vp->v_type != VDIR) 867 error = ENOTDIR; 868 else 869 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 870 while (!error && (mp = vp->v_mountedhere) != NULL) { 871 if (vfs_busy(mp, 0, 0)) 872 continue; 873 error = VFS_ROOT(mp, &tdp); 874 vfs_unbusy(mp); 875 if (error) 876 break; 877 vput(vp); 878 vp = tdp; 879 } 880 if (error) { 881 vput(vp); 882 goto out; 883 } 884 VOP_UNLOCK(vp, 0); 885 886 /* 887 * Disallow changing to a directory not under the process's 888 * current root directory (if there is one). 889 */ 890 if (cwdi->cwdi_rdir && !vn_isunder(vp, NULL, p)) { 891 vrele(vp); 892 error = EPERM; /* operation not permitted */ 893 goto out; 894 } 895 896 vrele(cwdi->cwdi_cdir); 897 cwdi->cwdi_cdir = vp; 898 out: 899 FILE_UNUSE(fp, p); 900 return (error); 901 } 902 903 /* 904 * Change this process's notion of the root directory to a given file descriptor. 905 */ 906 907 int 908 sys_fchroot(l, v, retval) 909 struct lwp *l; 910 void *v; 911 register_t *retval; 912 { 913 struct sys_fchroot_args *uap = v; 914 struct proc *p = l->l_proc; 915 struct filedesc *fdp = p->p_fd; 916 struct cwdinfo *cwdi = p->p_cwdi; 917 struct vnode *vp; 918 struct file *fp; 919 int error; 920 921 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 922 return error; 923 /* getvnode() will use the descriptor for us */ 924 if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0) 925 return error; 926 vp = (struct vnode *) fp->f_data; 927 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 928 if (vp->v_type != VDIR) 929 error = ENOTDIR; 930 else 931 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 932 VOP_UNLOCK(vp, 0); 933 if (error) 934 goto out; 935 VREF(vp); 936 937 /* 938 * Prevent escaping from chroot by putting the root under 939 * the working directory. Silently chdir to / if we aren't 940 * already there. 941 */ 942 if (!vn_isunder(cwdi->cwdi_cdir, vp, p)) { 943 /* 944 * XXX would be more failsafe to change directory to a 945 * deadfs node here instead 946 */ 947 vrele(cwdi->cwdi_cdir); 948 VREF(vp); 949 cwdi->cwdi_cdir = vp; 950 } 951 952 if (cwdi->cwdi_rdir != NULL) 953 vrele(cwdi->cwdi_rdir); 954 cwdi->cwdi_rdir = vp; 955 out: 956 FILE_UNUSE(fp, p); 957 return (error); 958 } 959 960 961 962 /* 963 * Change current working directory (``.''). 964 */ 965 /* ARGSUSED */ 966 int 967 sys_chdir(l, v, retval) 968 struct lwp *l; 969 void *v; 970 register_t *retval; 971 { 972 struct sys_chdir_args /* { 973 syscallarg(const char *) path; 974 } */ *uap = v; 975 struct proc *p = l->l_proc; 976 struct cwdinfo *cwdi = p->p_cwdi; 977 int error; 978 struct nameidata nd; 979 980 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 981 SCARG(uap, path), p); 982 if ((error = change_dir(&nd, p)) != 0) 983 return (error); 984 vrele(cwdi->cwdi_cdir); 985 cwdi->cwdi_cdir = nd.ni_vp; 986 return (0); 987 } 988 989 /* 990 * Change notion of root (``/'') directory. 991 */ 992 /* ARGSUSED */ 993 int 994 sys_chroot(l, v, retval) 995 struct lwp *l; 996 void *v; 997 register_t *retval; 998 { 999 struct sys_chroot_args /* { 1000 syscallarg(const char *) path; 1001 } */ *uap = v; 1002 struct proc *p = l->l_proc; 1003 struct cwdinfo *cwdi = p->p_cwdi; 1004 struct vnode *vp; 1005 int error; 1006 struct nameidata nd; 1007 1008 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 1009 return (error); 1010 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1011 SCARG(uap, path), p); 1012 if ((error = change_dir(&nd, p)) != 0) 1013 return (error); 1014 if (cwdi->cwdi_rdir != NULL) 1015 vrele(cwdi->cwdi_rdir); 1016 vp = nd.ni_vp; 1017 cwdi->cwdi_rdir = vp; 1018 1019 /* 1020 * Prevent escaping from chroot by putting the root under 1021 * the working directory. Silently chdir to / if we aren't 1022 * already there. 1023 */ 1024 if (!vn_isunder(cwdi->cwdi_cdir, vp, p)) { 1025 /* 1026 * XXX would be more failsafe to change directory to a 1027 * deadfs node here instead 1028 */ 1029 vrele(cwdi->cwdi_cdir); 1030 VREF(vp); 1031 cwdi->cwdi_cdir = vp; 1032 } 1033 1034 return (0); 1035 } 1036 1037 /* 1038 * Common routine for chroot and chdir. 1039 */ 1040 static int 1041 change_dir(ndp, p) 1042 struct nameidata *ndp; 1043 struct proc *p; 1044 { 1045 struct vnode *vp; 1046 int error; 1047 1048 if ((error = namei(ndp)) != 0) 1049 return (error); 1050 vp = ndp->ni_vp; 1051 if (vp->v_type != VDIR) 1052 error = ENOTDIR; 1053 else 1054 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 1055 1056 if (error) 1057 vput(vp); 1058 else 1059 VOP_UNLOCK(vp, 0); 1060 return (error); 1061 } 1062 1063 /* 1064 * Check permissions, allocate an open file structure, 1065 * and call the device open routine if any. 1066 */ 1067 int 1068 sys_open(l, v, retval) 1069 struct lwp *l; 1070 void *v; 1071 register_t *retval; 1072 { 1073 struct sys_open_args /* { 1074 syscallarg(const char *) path; 1075 syscallarg(int) flags; 1076 syscallarg(int) mode; 1077 } */ *uap = v; 1078 struct proc *p = l->l_proc; 1079 struct cwdinfo *cwdi = p->p_cwdi; 1080 struct filedesc *fdp = p->p_fd; 1081 struct file *fp; 1082 struct vnode *vp; 1083 int flags, cmode; 1084 int type, indx, error; 1085 struct flock lf; 1086 struct nameidata nd; 1087 1088 flags = FFLAGS(SCARG(uap, flags)); 1089 if ((flags & (FREAD | FWRITE)) == 0) 1090 return (EINVAL); 1091 /* falloc() will use the file descriptor for us */ 1092 if ((error = falloc(p, &fp, &indx)) != 0) 1093 return (error); 1094 cmode = ((SCARG(uap, mode) &~ cwdi->cwdi_cmask) & ALLPERMS) &~ S_ISTXT; 1095 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1096 p->p_dupfd = -indx - 1; /* XXX check for fdopen */ 1097 if ((error = vn_open(&nd, flags, cmode)) != 0) { 1098 FILE_UNUSE(fp, p); 1099 ffree(fp); 1100 if ((error == ENODEV || error == ENXIO) && 1101 p->p_dupfd >= 0 && /* XXX from fdopen */ 1102 (error = 1103 dupfdopen(p, indx, p->p_dupfd, flags, error)) == 0) { 1104 *retval = indx; 1105 return (0); 1106 } 1107 if (error == ERESTART) 1108 error = EINTR; 1109 fdremove(fdp, indx); 1110 return (error); 1111 } 1112 p->p_dupfd = 0; 1113 vp = nd.ni_vp; 1114 fp->f_flag = flags & FMASK; 1115 fp->f_type = DTYPE_VNODE; 1116 fp->f_ops = &vnops; 1117 fp->f_data = vp; 1118 if (flags & (O_EXLOCK | O_SHLOCK)) { 1119 lf.l_whence = SEEK_SET; 1120 lf.l_start = 0; 1121 lf.l_len = 0; 1122 if (flags & O_EXLOCK) 1123 lf.l_type = F_WRLCK; 1124 else 1125 lf.l_type = F_RDLCK; 1126 type = F_FLOCK; 1127 if ((flags & FNONBLOCK) == 0) 1128 type |= F_WAIT; 1129 VOP_UNLOCK(vp, 0); 1130 error = VOP_ADVLOCK(vp, fp, F_SETLK, &lf, type); 1131 if (error) { 1132 (void) vn_close(vp, fp->f_flag, fp->f_cred, p); 1133 FILE_UNUSE(fp, p); 1134 ffree(fp); 1135 fdremove(fdp, indx); 1136 return (error); 1137 } 1138 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1139 fp->f_flag |= FHASLOCK; 1140 } 1141 VOP_UNLOCK(vp, 0); 1142 *retval = indx; 1143 FILE_SET_MATURE(fp); 1144 FILE_UNUSE(fp, p); 1145 return (0); 1146 } 1147 1148 /* 1149 * Get file handle system call 1150 */ 1151 int 1152 sys_getfh(l, v, retval) 1153 struct lwp *l; 1154 void *v; 1155 register_t *retval; 1156 { 1157 struct sys_getfh_args /* { 1158 syscallarg(char *) fname; 1159 syscallarg(fhandle_t *) fhp; 1160 } */ *uap = v; 1161 struct proc *p = l->l_proc; 1162 struct vnode *vp; 1163 fhandle_t fh; 1164 int error; 1165 struct nameidata nd; 1166 1167 /* 1168 * Must be super user 1169 */ 1170 error = suser(p->p_ucred, &p->p_acflag); 1171 if (error) 1172 return (error); 1173 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1174 SCARG(uap, fname), p); 1175 error = namei(&nd); 1176 if (error) 1177 return (error); 1178 vp = nd.ni_vp; 1179 memset(&fh, 0, sizeof(fh)); 1180 fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid; 1181 error = VFS_VPTOFH(vp, &fh.fh_fid); 1182 vput(vp); 1183 if (error) 1184 return (error); 1185 error = copyout(&fh, (caddr_t)SCARG(uap, fhp), sizeof (fh)); 1186 return (error); 1187 } 1188 1189 /* 1190 * Open a file given a file handle. 1191 * 1192 * Check permissions, allocate an open file structure, 1193 * and call the device open routine if any. 1194 */ 1195 int 1196 sys_fhopen(l, v, retval) 1197 struct lwp *l; 1198 void *v; 1199 register_t *retval; 1200 { 1201 struct sys_fhopen_args /* { 1202 syscallarg(const fhandle_t *) fhp; 1203 syscallarg(int) flags; 1204 } */ *uap = v; 1205 struct proc *p = l->l_proc; 1206 struct filedesc *fdp = p->p_fd; 1207 struct file *fp; 1208 struct vnode *vp = NULL; 1209 struct mount *mp; 1210 struct ucred *cred = p->p_ucred; 1211 int flags; 1212 struct file *nfp; 1213 int type, indx, error=0; 1214 struct flock lf; 1215 struct vattr va; 1216 fhandle_t fh; 1217 1218 /* 1219 * Must be super user 1220 */ 1221 if ((error = suser(p->p_ucred, &p->p_acflag))) 1222 return (error); 1223 1224 flags = FFLAGS(SCARG(uap, flags)); 1225 if ((flags & (FREAD | FWRITE)) == 0) 1226 return (EINVAL); 1227 if ((flags & O_CREAT)) 1228 return (EINVAL); 1229 /* falloc() will use the file descriptor for us */ 1230 if ((error = falloc(p, &nfp, &indx)) != 0) 1231 return (error); 1232 fp = nfp; 1233 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1234 goto bad; 1235 1236 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) { 1237 error = ESTALE; 1238 goto bad; 1239 } 1240 1241 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp)) != 0) { 1242 vp = NULL; /* most likely unnecessary sanity for bad: */ 1243 goto bad; 1244 } 1245 1246 /* Now do an effective vn_open */ 1247 1248 if (vp->v_type == VSOCK) { 1249 error = EOPNOTSUPP; 1250 goto bad; 1251 } 1252 if (flags & FREAD) { 1253 if ((error = VOP_ACCESS(vp, VREAD, cred, p)) != 0) 1254 goto bad; 1255 } 1256 if (flags & (FWRITE | O_TRUNC)) { 1257 if (vp->v_type == VDIR) { 1258 error = EISDIR; 1259 goto bad; 1260 } 1261 if ((error = vn_writechk(vp)) != 0 || 1262 (error = VOP_ACCESS(vp, VWRITE, cred, p)) != 0) 1263 goto bad; 1264 } 1265 if (flags & O_TRUNC) { 1266 VOP_UNLOCK(vp, 0); /* XXX */ 1267 VOP_LEASE(vp, p, cred, LEASE_WRITE); 1268 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); /* XXX */ 1269 VATTR_NULL(&va); 1270 va.va_size = 0; 1271 if ((error = VOP_SETATTR(vp, &va, cred, p)) != 0) 1272 goto bad; 1273 } 1274 if ((error = VOP_OPEN(vp, flags, cred, p)) != 0) 1275 goto bad; 1276 if (vp->v_type == VREG && 1277 uvn_attach(vp, flags & FWRITE ? VM_PROT_WRITE : 0) == NULL) { 1278 error = EIO; 1279 goto bad; 1280 } 1281 if (flags & FWRITE) 1282 vp->v_writecount++; 1283 1284 /* done with modified vn_open, now finish what sys_open does. */ 1285 1286 fp->f_flag = flags & FMASK; 1287 fp->f_type = DTYPE_VNODE; 1288 fp->f_ops = &vnops; 1289 fp->f_data = vp; 1290 if (flags & (O_EXLOCK | O_SHLOCK)) { 1291 lf.l_whence = SEEK_SET; 1292 lf.l_start = 0; 1293 lf.l_len = 0; 1294 if (flags & O_EXLOCK) 1295 lf.l_type = F_WRLCK; 1296 else 1297 lf.l_type = F_RDLCK; 1298 type = F_FLOCK; 1299 if ((flags & FNONBLOCK) == 0) 1300 type |= F_WAIT; 1301 VOP_UNLOCK(vp, 0); 1302 error = VOP_ADVLOCK(vp, fp, F_SETLK, &lf, type); 1303 if (error) { 1304 (void) vn_close(vp, fp->f_flag, fp->f_cred, p); 1305 FILE_UNUSE(fp, p); 1306 ffree(fp); 1307 fdremove(fdp, indx); 1308 return (error); 1309 } 1310 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1311 fp->f_flag |= FHASLOCK; 1312 } 1313 VOP_UNLOCK(vp, 0); 1314 *retval = indx; 1315 FILE_SET_MATURE(fp); 1316 FILE_UNUSE(fp, p); 1317 return (0); 1318 1319 bad: 1320 FILE_UNUSE(fp, p); 1321 ffree(fp); 1322 fdremove(fdp, indx); 1323 if (vp != NULL) 1324 vput(vp); 1325 return (error); 1326 } 1327 1328 /* ARGSUSED */ 1329 int 1330 sys_fhstat(l, v, retval) 1331 struct lwp *l; 1332 void *v; 1333 register_t *retval; 1334 { 1335 struct sys_fhstat_args /* { 1336 syscallarg(const fhandle_t *) fhp; 1337 syscallarg(struct stat *) sb; 1338 } */ *uap = v; 1339 struct proc *p = l->l_proc; 1340 struct stat sb; 1341 int error; 1342 fhandle_t fh; 1343 struct mount *mp; 1344 struct vnode *vp; 1345 1346 /* 1347 * Must be super user 1348 */ 1349 if ((error = suser(p->p_ucred, &p->p_acflag))) 1350 return (error); 1351 1352 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1353 return (error); 1354 1355 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) 1356 return (ESTALE); 1357 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp))) 1358 return (error); 1359 error = vn_stat(vp, &sb, p); 1360 vput(vp); 1361 if (error) 1362 return (error); 1363 error = copyout(&sb, SCARG(uap, sb), sizeof(sb)); 1364 return (error); 1365 } 1366 1367 /* ARGSUSED */ 1368 int 1369 sys_fhstatfs(l, v, retval) 1370 struct lwp *l; 1371 void *v; 1372 register_t *retval; 1373 { 1374 struct sys_fhstatfs_args /* 1375 syscallarg(const fhandle_t *) fhp; 1376 syscallarg(struct statfs *) buf; 1377 } */ *uap = v; 1378 struct proc *p = l->l_proc; 1379 struct statfs sbuf; 1380 fhandle_t fh; 1381 struct mount *mp; 1382 struct vnode *vp; 1383 int error; 1384 1385 /* 1386 * Must be super user 1387 */ 1388 if ((error = suser(p->p_ucred, &p->p_acflag))) 1389 return (error); 1390 1391 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1392 return (error); 1393 1394 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) 1395 return (ESTALE); 1396 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp))) 1397 return (error); 1398 mp = vp->v_mount; 1399 vput(vp); 1400 if ((error = VFS_STATFS(mp, &sbuf, p)) != 0) 1401 return (error); 1402 return (copyout(&sbuf, SCARG(uap, buf), sizeof(sbuf))); 1403 } 1404 1405 /* 1406 * Create a special file. 1407 */ 1408 /* ARGSUSED */ 1409 int 1410 sys_mknod(l, v, retval) 1411 struct lwp *l; 1412 void *v; 1413 register_t *retval; 1414 { 1415 struct sys_mknod_args /* { 1416 syscallarg(const char *) path; 1417 syscallarg(int) mode; 1418 syscallarg(int) dev; 1419 } */ *uap = v; 1420 struct proc *p = l->l_proc; 1421 struct vnode *vp; 1422 struct vattr vattr; 1423 int error; 1424 int whiteout = 0; 1425 struct nameidata nd; 1426 1427 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 1428 return (error); 1429 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 1430 if ((error = namei(&nd)) != 0) 1431 return (error); 1432 vp = nd.ni_vp; 1433 if (vp != NULL) 1434 error = EEXIST; 1435 else { 1436 VATTR_NULL(&vattr); 1437 vattr.va_mode = 1438 (SCARG(uap, mode) & ALLPERMS) &~ p->p_cwdi->cwdi_cmask; 1439 vattr.va_rdev = SCARG(uap, dev); 1440 whiteout = 0; 1441 1442 switch (SCARG(uap, mode) & S_IFMT) { 1443 case S_IFMT: /* used by badsect to flag bad sectors */ 1444 vattr.va_type = VBAD; 1445 break; 1446 case S_IFCHR: 1447 vattr.va_type = VCHR; 1448 break; 1449 case S_IFBLK: 1450 vattr.va_type = VBLK; 1451 break; 1452 case S_IFWHT: 1453 whiteout = 1; 1454 break; 1455 default: 1456 error = EINVAL; 1457 break; 1458 } 1459 } 1460 if (!error) { 1461 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1462 if (whiteout) { 1463 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE); 1464 if (error) 1465 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1466 vput(nd.ni_dvp); 1467 } else { 1468 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, 1469 &nd.ni_cnd, &vattr); 1470 if (error == 0) 1471 vput(nd.ni_vp); 1472 } 1473 } else { 1474 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1475 if (nd.ni_dvp == vp) 1476 vrele(nd.ni_dvp); 1477 else 1478 vput(nd.ni_dvp); 1479 if (vp) 1480 vrele(vp); 1481 } 1482 return (error); 1483 } 1484 1485 /* 1486 * Create a named pipe. 1487 */ 1488 /* ARGSUSED */ 1489 int 1490 sys_mkfifo(l, v, retval) 1491 struct lwp *l; 1492 void *v; 1493 register_t *retval; 1494 { 1495 struct sys_mkfifo_args /* { 1496 syscallarg(const char *) path; 1497 syscallarg(int) mode; 1498 } */ *uap = v; 1499 struct proc *p = l->l_proc; 1500 struct vattr vattr; 1501 int error; 1502 struct nameidata nd; 1503 1504 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 1505 if ((error = namei(&nd)) != 0) 1506 return (error); 1507 if (nd.ni_vp != NULL) { 1508 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1509 if (nd.ni_dvp == nd.ni_vp) 1510 vrele(nd.ni_dvp); 1511 else 1512 vput(nd.ni_dvp); 1513 vrele(nd.ni_vp); 1514 return (EEXIST); 1515 } 1516 VATTR_NULL(&vattr); 1517 vattr.va_type = VFIFO; 1518 vattr.va_mode = (SCARG(uap, mode) & ALLPERMS) &~ p->p_cwdi->cwdi_cmask; 1519 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1520 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 1521 if (error == 0) 1522 vput(nd.ni_vp); 1523 return (error); 1524 } 1525 1526 /* 1527 * Make a hard file link. 1528 */ 1529 /* ARGSUSED */ 1530 int 1531 sys_link(l, v, retval) 1532 struct lwp *l; 1533 void *v; 1534 register_t *retval; 1535 { 1536 struct sys_link_args /* { 1537 syscallarg(const char *) path; 1538 syscallarg(const char *) link; 1539 } */ *uap = v; 1540 struct proc *p = l->l_proc; 1541 struct vnode *vp; 1542 struct nameidata nd; 1543 int error; 1544 1545 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1546 if ((error = namei(&nd)) != 0) 1547 return (error); 1548 vp = nd.ni_vp; 1549 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 1550 if ((error = namei(&nd)) != 0) 1551 goto out; 1552 if (nd.ni_vp) { 1553 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1554 if (nd.ni_dvp == nd.ni_vp) 1555 vrele(nd.ni_dvp); 1556 else 1557 vput(nd.ni_dvp); 1558 vrele(nd.ni_vp); 1559 error = EEXIST; 1560 goto out; 1561 } 1562 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1563 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1564 error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd); 1565 out: 1566 vrele(vp); 1567 return (error); 1568 } 1569 1570 /* 1571 * Make a symbolic link. 1572 */ 1573 /* ARGSUSED */ 1574 int 1575 sys_symlink(l, v, retval) 1576 struct lwp *l; 1577 void *v; 1578 register_t *retval; 1579 { 1580 struct sys_symlink_args /* { 1581 syscallarg(const char *) path; 1582 syscallarg(const char *) link; 1583 } */ *uap = v; 1584 struct proc *p = l->l_proc; 1585 struct vattr vattr; 1586 char *path; 1587 int error; 1588 struct nameidata nd; 1589 1590 path = PNBUF_GET(); 1591 error = copyinstr(SCARG(uap, path), path, MAXPATHLEN, NULL); 1592 if (error) 1593 goto out; 1594 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 1595 if ((error = namei(&nd)) != 0) 1596 goto out; 1597 if (nd.ni_vp) { 1598 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1599 if (nd.ni_dvp == nd.ni_vp) 1600 vrele(nd.ni_dvp); 1601 else 1602 vput(nd.ni_dvp); 1603 vrele(nd.ni_vp); 1604 error = EEXIST; 1605 goto out; 1606 } 1607 VATTR_NULL(&vattr); 1608 vattr.va_mode = ACCESSPERMS &~ p->p_cwdi->cwdi_cmask; 1609 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1610 error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, path); 1611 if (error == 0) 1612 vput(nd.ni_vp); 1613 out: 1614 PNBUF_PUT(path); 1615 return (error); 1616 } 1617 1618 /* 1619 * Delete a whiteout from the filesystem. 1620 */ 1621 /* ARGSUSED */ 1622 int 1623 sys_undelete(l, v, retval) 1624 struct lwp *l; 1625 void *v; 1626 register_t *retval; 1627 { 1628 struct sys_undelete_args /* { 1629 syscallarg(const char *) path; 1630 } */ *uap = v; 1631 struct proc *p = l->l_proc; 1632 int error; 1633 struct nameidata nd; 1634 1635 NDINIT(&nd, DELETE, LOCKPARENT|DOWHITEOUT, UIO_USERSPACE, 1636 SCARG(uap, path), p); 1637 error = namei(&nd); 1638 if (error) 1639 return (error); 1640 1641 if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) { 1642 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1643 if (nd.ni_dvp == nd.ni_vp) 1644 vrele(nd.ni_dvp); 1645 else 1646 vput(nd.ni_dvp); 1647 if (nd.ni_vp) 1648 vrele(nd.ni_vp); 1649 return (EEXIST); 1650 } 1651 1652 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1653 if ((error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE)) != 0) 1654 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1655 vput(nd.ni_dvp); 1656 return (error); 1657 } 1658 1659 /* 1660 * Delete a name from the filesystem. 1661 */ 1662 /* ARGSUSED */ 1663 int 1664 sys_unlink(l, v, retval) 1665 struct lwp *l; 1666 void *v; 1667 register_t *retval; 1668 { 1669 struct sys_unlink_args /* { 1670 syscallarg(const char *) path; 1671 } */ *uap = v; 1672 struct proc *p = l->l_proc; 1673 struct vnode *vp; 1674 int error; 1675 struct nameidata nd; 1676 1677 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 1678 SCARG(uap, path), p); 1679 if ((error = namei(&nd)) != 0) 1680 return (error); 1681 vp = nd.ni_vp; 1682 1683 /* 1684 * The root of a mounted filesystem cannot be deleted. 1685 */ 1686 if (vp->v_flag & VROOT) { 1687 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1688 if (nd.ni_dvp == vp) 1689 vrele(nd.ni_dvp); 1690 else 1691 vput(nd.ni_dvp); 1692 vput(vp); 1693 error = EBUSY; 1694 goto out; 1695 } 1696 1697 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1698 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1699 error = VOP_REMOVE(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 1700 out: 1701 return (error); 1702 } 1703 1704 /* 1705 * Reposition read/write file offset. 1706 */ 1707 int 1708 sys_lseek(l, v, retval) 1709 struct lwp *l; 1710 void *v; 1711 register_t *retval; 1712 { 1713 struct sys_lseek_args /* { 1714 syscallarg(int) fd; 1715 syscallarg(int) pad; 1716 syscallarg(off_t) offset; 1717 syscallarg(int) whence; 1718 } */ *uap = v; 1719 struct proc *p = l->l_proc; 1720 struct ucred *cred = p->p_ucred; 1721 struct filedesc *fdp = p->p_fd; 1722 struct file *fp; 1723 struct vnode *vp; 1724 struct vattr vattr; 1725 off_t newoff; 1726 int error; 1727 1728 if ((fp = fd_getfile(fdp, SCARG(uap, fd))) == NULL) 1729 return (EBADF); 1730 1731 FILE_USE(fp); 1732 1733 vp = (struct vnode *)fp->f_data; 1734 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1735 error = ESPIPE; 1736 goto out; 1737 } 1738 1739 switch (SCARG(uap, whence)) { 1740 case SEEK_CUR: 1741 newoff = fp->f_offset + SCARG(uap, offset); 1742 break; 1743 case SEEK_END: 1744 error = VOP_GETATTR(vp, &vattr, cred, p); 1745 if (error) 1746 goto out; 1747 newoff = SCARG(uap, offset) + vattr.va_size; 1748 break; 1749 case SEEK_SET: 1750 newoff = SCARG(uap, offset); 1751 break; 1752 default: 1753 error = EINVAL; 1754 goto out; 1755 } 1756 if ((error = VOP_SEEK(vp, fp->f_offset, newoff, cred)) != 0) 1757 goto out; 1758 1759 *(off_t *)retval = fp->f_offset = newoff; 1760 out: 1761 FILE_UNUSE(fp, p); 1762 return (error); 1763 } 1764 1765 /* 1766 * Positional read system call. 1767 */ 1768 int 1769 sys_pread(l, v, retval) 1770 struct lwp *l; 1771 void *v; 1772 register_t *retval; 1773 { 1774 struct sys_pread_args /* { 1775 syscallarg(int) fd; 1776 syscallarg(void *) buf; 1777 syscallarg(size_t) nbyte; 1778 syscallarg(off_t) offset; 1779 } */ *uap = v; 1780 struct proc *p = l->l_proc; 1781 struct filedesc *fdp = p->p_fd; 1782 struct file *fp; 1783 struct vnode *vp; 1784 off_t offset; 1785 int error, fd = SCARG(uap, fd); 1786 1787 if ((fp = fd_getfile(fdp, fd)) == NULL) 1788 return (EBADF); 1789 1790 if ((fp->f_flag & FREAD) == 0) { 1791 simple_unlock(&fp->f_slock); 1792 return (EBADF); 1793 } 1794 1795 FILE_USE(fp); 1796 1797 vp = (struct vnode *)fp->f_data; 1798 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1799 error = ESPIPE; 1800 goto out; 1801 } 1802 1803 offset = SCARG(uap, offset); 1804 1805 /* 1806 * XXX This works because no file systems actually 1807 * XXX take any action on the seek operation. 1808 */ 1809 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1810 goto out; 1811 1812 /* dofileread() will unuse the descriptor for us */ 1813 return (dofileread(p, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 1814 &offset, 0, retval)); 1815 1816 out: 1817 FILE_UNUSE(fp, p); 1818 return (error); 1819 } 1820 1821 /* 1822 * Positional scatter read system call. 1823 */ 1824 int 1825 sys_preadv(l, v, retval) 1826 struct lwp *l; 1827 void *v; 1828 register_t *retval; 1829 { 1830 struct sys_preadv_args /* { 1831 syscallarg(int) fd; 1832 syscallarg(const struct iovec *) iovp; 1833 syscallarg(int) iovcnt; 1834 syscallarg(off_t) offset; 1835 } */ *uap = v; 1836 struct proc *p = l->l_proc; 1837 struct filedesc *fdp = p->p_fd; 1838 struct file *fp; 1839 struct vnode *vp; 1840 off_t offset; 1841 int error, fd = SCARG(uap, fd); 1842 1843 if ((fp = fd_getfile(fdp, fd)) == NULL) 1844 return (EBADF); 1845 1846 if ((fp->f_flag & FREAD) == 0) { 1847 simple_unlock(&fp->f_slock); 1848 return (EBADF); 1849 } 1850 1851 FILE_USE(fp); 1852 1853 vp = (struct vnode *)fp->f_data; 1854 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1855 error = ESPIPE; 1856 goto out; 1857 } 1858 1859 offset = SCARG(uap, offset); 1860 1861 /* 1862 * XXX This works because no file systems actually 1863 * XXX take any action on the seek operation. 1864 */ 1865 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1866 goto out; 1867 1868 /* dofilereadv() will unuse the descriptor for us */ 1869 return (dofilereadv(p, fd, fp, SCARG(uap, iovp), SCARG(uap, iovcnt), 1870 &offset, 0, retval)); 1871 1872 out: 1873 FILE_UNUSE(fp, p); 1874 return (error); 1875 } 1876 1877 /* 1878 * Positional write system call. 1879 */ 1880 int 1881 sys_pwrite(l, v, retval) 1882 struct lwp *l; 1883 void *v; 1884 register_t *retval; 1885 { 1886 struct sys_pwrite_args /* { 1887 syscallarg(int) fd; 1888 syscallarg(const void *) buf; 1889 syscallarg(size_t) nbyte; 1890 syscallarg(off_t) offset; 1891 } */ *uap = v; 1892 struct proc *p = l->l_proc; 1893 struct filedesc *fdp = p->p_fd; 1894 struct file *fp; 1895 struct vnode *vp; 1896 off_t offset; 1897 int error, fd = SCARG(uap, fd); 1898 1899 if ((fp = fd_getfile(fdp, fd)) == NULL) 1900 return (EBADF); 1901 1902 if ((fp->f_flag & FWRITE) == 0) { 1903 simple_unlock(&fp->f_slock); 1904 return (EBADF); 1905 } 1906 1907 FILE_USE(fp); 1908 1909 vp = (struct vnode *)fp->f_data; 1910 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1911 error = ESPIPE; 1912 goto out; 1913 } 1914 1915 offset = SCARG(uap, offset); 1916 1917 /* 1918 * XXX This works because no file systems actually 1919 * XXX take any action on the seek operation. 1920 */ 1921 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1922 goto out; 1923 1924 /* dofilewrite() will unuse the descriptor for us */ 1925 return (dofilewrite(p, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 1926 &offset, 0, retval)); 1927 1928 out: 1929 FILE_UNUSE(fp, p); 1930 return (error); 1931 } 1932 1933 /* 1934 * Positional gather write system call. 1935 */ 1936 int 1937 sys_pwritev(l, v, retval) 1938 struct lwp *l; 1939 void *v; 1940 register_t *retval; 1941 { 1942 struct sys_pwritev_args /* { 1943 syscallarg(int) fd; 1944 syscallarg(const struct iovec *) iovp; 1945 syscallarg(int) iovcnt; 1946 syscallarg(off_t) offset; 1947 } */ *uap = v; 1948 struct proc *p = l->l_proc; 1949 struct filedesc *fdp = p->p_fd; 1950 struct file *fp; 1951 struct vnode *vp; 1952 off_t offset; 1953 int error, fd = SCARG(uap, fd); 1954 1955 if ((fp = fd_getfile(fdp, fd)) == NULL) 1956 return (EBADF); 1957 1958 if ((fp->f_flag & FWRITE) == 0) { 1959 simple_unlock(&fp->f_slock); 1960 return (EBADF); 1961 } 1962 1963 FILE_USE(fp); 1964 1965 vp = (struct vnode *)fp->f_data; 1966 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1967 error = ESPIPE; 1968 goto out; 1969 } 1970 1971 offset = SCARG(uap, offset); 1972 1973 /* 1974 * XXX This works because no file systems actually 1975 * XXX take any action on the seek operation. 1976 */ 1977 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1978 goto out; 1979 1980 /* dofilewritev() will unuse the descriptor for us */ 1981 return (dofilewritev(p, fd, fp, SCARG(uap, iovp), SCARG(uap, iovcnt), 1982 &offset, 0, retval)); 1983 1984 out: 1985 FILE_UNUSE(fp, p); 1986 return (error); 1987 } 1988 1989 /* 1990 * Check access permissions. 1991 */ 1992 int 1993 sys_access(l, v, retval) 1994 struct lwp *l; 1995 void *v; 1996 register_t *retval; 1997 { 1998 struct sys_access_args /* { 1999 syscallarg(const char *) path; 2000 syscallarg(int) flags; 2001 } */ *uap = v; 2002 struct proc *p = l->l_proc; 2003 struct ucred *cred = crget(); 2004 struct vnode *vp; 2005 int error, flags; 2006 struct nameidata nd; 2007 2008 (void)memcpy(cred, p->p_ucred, sizeof(*cred)); 2009 cred->cr_ref = 1; 2010 cred->cr_uid = p->p_cred->p_ruid; 2011 cred->cr_gid = p->p_cred->p_rgid; 2012 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 2013 SCARG(uap, path), p); 2014 /* Override default credentials */ 2015 nd.ni_cnd.cn_cred = cred; 2016 if ((error = namei(&nd)) != 0) 2017 goto out; 2018 vp = nd.ni_vp; 2019 2020 /* Flags == 0 means only check for existence. */ 2021 if (SCARG(uap, flags)) { 2022 flags = 0; 2023 if (SCARG(uap, flags) & R_OK) 2024 flags |= VREAD; 2025 if (SCARG(uap, flags) & W_OK) 2026 flags |= VWRITE; 2027 if (SCARG(uap, flags) & X_OK) 2028 flags |= VEXEC; 2029 2030 error = VOP_ACCESS(vp, flags, cred, p); 2031 if (!error && (flags & VWRITE)) 2032 error = vn_writechk(vp); 2033 } 2034 vput(vp); 2035 out: 2036 crfree(cred); 2037 return (error); 2038 } 2039 2040 /* 2041 * Get file status; this version follows links. 2042 */ 2043 /* ARGSUSED */ 2044 int 2045 sys___stat13(l, v, retval) 2046 struct lwp *l; 2047 void *v; 2048 register_t *retval; 2049 { 2050 struct sys___stat13_args /* { 2051 syscallarg(const char *) path; 2052 syscallarg(struct stat *) ub; 2053 } */ *uap = v; 2054 struct proc *p = l->l_proc; 2055 struct stat sb; 2056 int error; 2057 struct nameidata nd; 2058 2059 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 2060 SCARG(uap, path), p); 2061 if ((error = namei(&nd)) != 0) 2062 return (error); 2063 error = vn_stat(nd.ni_vp, &sb, p); 2064 vput(nd.ni_vp); 2065 if (error) 2066 return (error); 2067 error = copyout(&sb, SCARG(uap, ub), sizeof(sb)); 2068 return (error); 2069 } 2070 2071 /* 2072 * Get file status; this version does not follow links. 2073 */ 2074 /* ARGSUSED */ 2075 int 2076 sys___lstat13(l, v, retval) 2077 struct lwp *l; 2078 void *v; 2079 register_t *retval; 2080 { 2081 struct sys___lstat13_args /* { 2082 syscallarg(const char *) path; 2083 syscallarg(struct stat *) ub; 2084 } */ *uap = v; 2085 struct proc *p = l->l_proc; 2086 struct stat sb; 2087 int error; 2088 struct nameidata nd; 2089 2090 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 2091 SCARG(uap, path), p); 2092 if ((error = namei(&nd)) != 0) 2093 return (error); 2094 error = vn_stat(nd.ni_vp, &sb, p); 2095 vput(nd.ni_vp); 2096 if (error) 2097 return (error); 2098 error = copyout(&sb, SCARG(uap, ub), sizeof(sb)); 2099 return (error); 2100 } 2101 2102 /* 2103 * Get configurable pathname variables. 2104 */ 2105 /* ARGSUSED */ 2106 int 2107 sys_pathconf(l, v, retval) 2108 struct lwp *l; 2109 void *v; 2110 register_t *retval; 2111 { 2112 struct sys_pathconf_args /* { 2113 syscallarg(const char *) path; 2114 syscallarg(int) name; 2115 } */ *uap = v; 2116 struct proc *p = l->l_proc; 2117 int error; 2118 struct nameidata nd; 2119 2120 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 2121 SCARG(uap, path), p); 2122 if ((error = namei(&nd)) != 0) 2123 return (error); 2124 error = VOP_PATHCONF(nd.ni_vp, SCARG(uap, name), retval); 2125 vput(nd.ni_vp); 2126 return (error); 2127 } 2128 2129 /* 2130 * Return target name of a symbolic link. 2131 */ 2132 /* ARGSUSED */ 2133 int 2134 sys_readlink(l, v, retval) 2135 struct lwp *l; 2136 void *v; 2137 register_t *retval; 2138 { 2139 struct sys_readlink_args /* { 2140 syscallarg(const char *) path; 2141 syscallarg(char *) buf; 2142 syscallarg(size_t) count; 2143 } */ *uap = v; 2144 struct proc *p = l->l_proc; 2145 struct vnode *vp; 2146 struct iovec aiov; 2147 struct uio auio; 2148 int error; 2149 struct nameidata nd; 2150 2151 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 2152 SCARG(uap, path), p); 2153 if ((error = namei(&nd)) != 0) 2154 return (error); 2155 vp = nd.ni_vp; 2156 if (vp->v_type != VLNK) 2157 error = EINVAL; 2158 else if (!(vp->v_mount->mnt_flag & MNT_SYMPERM) || 2159 (error = VOP_ACCESS(vp, VREAD, p->p_ucred, p)) == 0) { 2160 aiov.iov_base = SCARG(uap, buf); 2161 aiov.iov_len = SCARG(uap, count); 2162 auio.uio_iov = &aiov; 2163 auio.uio_iovcnt = 1; 2164 auio.uio_offset = 0; 2165 auio.uio_rw = UIO_READ; 2166 auio.uio_segflg = UIO_USERSPACE; 2167 auio.uio_procp = p; 2168 auio.uio_resid = SCARG(uap, count); 2169 error = VOP_READLINK(vp, &auio, p->p_ucred); 2170 } 2171 vput(vp); 2172 *retval = SCARG(uap, count) - auio.uio_resid; 2173 return (error); 2174 } 2175 2176 /* 2177 * Change flags of a file given a path name. 2178 */ 2179 /* ARGSUSED */ 2180 int 2181 sys_chflags(l, v, retval) 2182 struct lwp *l; 2183 void *v; 2184 register_t *retval; 2185 { 2186 struct sys_chflags_args /* { 2187 syscallarg(const char *) path; 2188 syscallarg(u_long) flags; 2189 } */ *uap = v; 2190 struct proc *p = l->l_proc; 2191 struct vnode *vp; 2192 int error; 2193 struct nameidata nd; 2194 2195 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2196 if ((error = namei(&nd)) != 0) 2197 return (error); 2198 vp = nd.ni_vp; 2199 error = change_flags(vp, SCARG(uap, flags), p); 2200 vput(vp); 2201 return (error); 2202 } 2203 2204 /* 2205 * Change flags of a file given a file descriptor. 2206 */ 2207 /* ARGSUSED */ 2208 int 2209 sys_fchflags(l, v, retval) 2210 struct lwp *l; 2211 void *v; 2212 register_t *retval; 2213 { 2214 struct sys_fchflags_args /* { 2215 syscallarg(int) fd; 2216 syscallarg(u_long) flags; 2217 } */ *uap = v; 2218 struct proc *p = l->l_proc; 2219 struct vnode *vp; 2220 struct file *fp; 2221 int error; 2222 2223 /* getvnode() will use the descriptor for us */ 2224 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2225 return (error); 2226 vp = (struct vnode *)fp->f_data; 2227 error = change_flags(vp, SCARG(uap, flags), p); 2228 VOP_UNLOCK(vp, 0); 2229 FILE_UNUSE(fp, p); 2230 return (error); 2231 } 2232 2233 /* 2234 * Change flags of a file given a path name; this version does 2235 * not follow links. 2236 */ 2237 int 2238 sys_lchflags(l, v, retval) 2239 struct lwp *l; 2240 void *v; 2241 register_t *retval; 2242 { 2243 struct sys_lchflags_args /* { 2244 syscallarg(const char *) path; 2245 syscallarg(u_long) flags; 2246 } */ *uap = v; 2247 struct proc *p = l->l_proc; 2248 struct vnode *vp; 2249 int error; 2250 struct nameidata nd; 2251 2252 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2253 if ((error = namei(&nd)) != 0) 2254 return (error); 2255 vp = nd.ni_vp; 2256 error = change_flags(vp, SCARG(uap, flags), p); 2257 vput(vp); 2258 return (error); 2259 } 2260 2261 /* 2262 * Common routine to change flags of a file. 2263 */ 2264 int 2265 change_flags(vp, flags, p) 2266 struct vnode *vp; 2267 u_long flags; 2268 struct proc *p; 2269 { 2270 struct vattr vattr; 2271 int error; 2272 2273 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2274 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2275 /* 2276 * Non-superusers cannot change the flags on devices, even if they 2277 * own them. 2278 */ 2279 if (suser(p->p_ucred, &p->p_acflag) != 0) { 2280 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2281 goto out; 2282 if (vattr.va_type == VCHR || vattr.va_type == VBLK) { 2283 error = EINVAL; 2284 goto out; 2285 } 2286 } 2287 VATTR_NULL(&vattr); 2288 vattr.va_flags = flags; 2289 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2290 out: 2291 return (error); 2292 } 2293 2294 /* 2295 * Change mode of a file given path name; this version follows links. 2296 */ 2297 /* ARGSUSED */ 2298 int 2299 sys_chmod(l, v, retval) 2300 struct lwp *l; 2301 void *v; 2302 register_t *retval; 2303 { 2304 struct sys_chmod_args /* { 2305 syscallarg(const char *) path; 2306 syscallarg(int) mode; 2307 } */ *uap = v; 2308 struct proc *p = l->l_proc; 2309 int error; 2310 struct nameidata nd; 2311 2312 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2313 if ((error = namei(&nd)) != 0) 2314 return (error); 2315 2316 error = change_mode(nd.ni_vp, SCARG(uap, mode), p); 2317 2318 vrele(nd.ni_vp); 2319 return (error); 2320 } 2321 2322 /* 2323 * Change mode of a file given a file descriptor. 2324 */ 2325 /* ARGSUSED */ 2326 int 2327 sys_fchmod(l, v, retval) 2328 struct lwp *l; 2329 void *v; 2330 register_t *retval; 2331 { 2332 struct sys_fchmod_args /* { 2333 syscallarg(int) fd; 2334 syscallarg(int) mode; 2335 } */ *uap = v; 2336 struct proc *p = l->l_proc; 2337 struct file *fp; 2338 int error; 2339 2340 /* getvnode() will use the descriptor for us */ 2341 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2342 return (error); 2343 2344 error = change_mode((struct vnode *)fp->f_data, SCARG(uap, mode), p); 2345 FILE_UNUSE(fp, p); 2346 return (error); 2347 } 2348 2349 /* 2350 * Change mode of a file given path name; this version does not follow links. 2351 */ 2352 /* ARGSUSED */ 2353 int 2354 sys_lchmod(l, v, retval) 2355 struct lwp *l; 2356 void *v; 2357 register_t *retval; 2358 { 2359 struct sys_lchmod_args /* { 2360 syscallarg(const char *) path; 2361 syscallarg(int) mode; 2362 } */ *uap = v; 2363 struct proc *p = l->l_proc; 2364 int error; 2365 struct nameidata nd; 2366 2367 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2368 if ((error = namei(&nd)) != 0) 2369 return (error); 2370 2371 error = change_mode(nd.ni_vp, SCARG(uap, mode), p); 2372 2373 vrele(nd.ni_vp); 2374 return (error); 2375 } 2376 2377 /* 2378 * Common routine to set mode given a vnode. 2379 */ 2380 static int 2381 change_mode(vp, mode, p) 2382 struct vnode *vp; 2383 int mode; 2384 struct proc *p; 2385 { 2386 struct vattr vattr; 2387 int error; 2388 2389 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2390 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2391 VATTR_NULL(&vattr); 2392 vattr.va_mode = mode & ALLPERMS; 2393 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2394 VOP_UNLOCK(vp, 0); 2395 return (error); 2396 } 2397 2398 /* 2399 * Set ownership given a path name; this version follows links. 2400 */ 2401 /* ARGSUSED */ 2402 int 2403 sys_chown(l, v, retval) 2404 struct lwp *l; 2405 void *v; 2406 register_t *retval; 2407 { 2408 struct sys_chown_args /* { 2409 syscallarg(const char *) path; 2410 syscallarg(uid_t) uid; 2411 syscallarg(gid_t) gid; 2412 } */ *uap = v; 2413 struct proc *p = l->l_proc; 2414 int error; 2415 struct nameidata nd; 2416 2417 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2418 if ((error = namei(&nd)) != 0) 2419 return (error); 2420 2421 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 0); 2422 2423 vrele(nd.ni_vp); 2424 return (error); 2425 } 2426 2427 /* 2428 * Set ownership given a path name; this version follows links. 2429 * Provides POSIX semantics. 2430 */ 2431 /* ARGSUSED */ 2432 int 2433 sys___posix_chown(l, v, retval) 2434 struct lwp *l; 2435 void *v; 2436 register_t *retval; 2437 { 2438 struct sys_chown_args /* { 2439 syscallarg(const char *) path; 2440 syscallarg(uid_t) uid; 2441 syscallarg(gid_t) gid; 2442 } */ *uap = v; 2443 struct proc *p = l->l_proc; 2444 int error; 2445 struct nameidata nd; 2446 2447 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2448 if ((error = namei(&nd)) != 0) 2449 return (error); 2450 2451 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 1); 2452 2453 vrele(nd.ni_vp); 2454 return (error); 2455 } 2456 2457 /* 2458 * Set ownership given a file descriptor. 2459 */ 2460 /* ARGSUSED */ 2461 int 2462 sys_fchown(l, v, retval) 2463 struct lwp *l; 2464 void *v; 2465 register_t *retval; 2466 { 2467 struct sys_fchown_args /* { 2468 syscallarg(int) fd; 2469 syscallarg(uid_t) uid; 2470 syscallarg(gid_t) gid; 2471 } */ *uap = v; 2472 struct proc *p = l->l_proc; 2473 int error; 2474 struct file *fp; 2475 2476 /* getvnode() will use the descriptor for us */ 2477 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2478 return (error); 2479 2480 error = change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 2481 SCARG(uap, gid), p, 0); 2482 FILE_UNUSE(fp, p); 2483 return (error); 2484 } 2485 2486 /* 2487 * Set ownership given a file descriptor, providing POSIX/XPG semantics. 2488 */ 2489 /* ARGSUSED */ 2490 int 2491 sys___posix_fchown(l, v, retval) 2492 struct lwp *l; 2493 void *v; 2494 register_t *retval; 2495 { 2496 struct sys_fchown_args /* { 2497 syscallarg(int) fd; 2498 syscallarg(uid_t) uid; 2499 syscallarg(gid_t) gid; 2500 } */ *uap = v; 2501 struct proc *p = l->l_proc; 2502 int error; 2503 struct file *fp; 2504 2505 /* getvnode() will use the descriptor for us */ 2506 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2507 return (error); 2508 2509 error = change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 2510 SCARG(uap, gid), p, 1); 2511 FILE_UNUSE(fp, p); 2512 return (error); 2513 } 2514 2515 /* 2516 * Set ownership given a path name; this version does not follow links. 2517 */ 2518 /* ARGSUSED */ 2519 int 2520 sys_lchown(l, v, retval) 2521 struct lwp *l; 2522 void *v; 2523 register_t *retval; 2524 { 2525 struct sys_lchown_args /* { 2526 syscallarg(const char *) path; 2527 syscallarg(uid_t) uid; 2528 syscallarg(gid_t) gid; 2529 } */ *uap = v; 2530 struct proc *p = l->l_proc; 2531 int error; 2532 struct nameidata nd; 2533 2534 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2535 if ((error = namei(&nd)) != 0) 2536 return (error); 2537 2538 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 0); 2539 2540 vrele(nd.ni_vp); 2541 return (error); 2542 } 2543 2544 /* 2545 * Set ownership given a path name; this version does not follow links. 2546 * Provides POSIX/XPG semantics. 2547 */ 2548 /* ARGSUSED */ 2549 int 2550 sys___posix_lchown(l, v, retval) 2551 struct lwp *l; 2552 void *v; 2553 register_t *retval; 2554 { 2555 struct sys_lchown_args /* { 2556 syscallarg(const char *) path; 2557 syscallarg(uid_t) uid; 2558 syscallarg(gid_t) gid; 2559 } */ *uap = v; 2560 struct proc *p = l->l_proc; 2561 int error; 2562 struct nameidata nd; 2563 2564 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2565 if ((error = namei(&nd)) != 0) 2566 return (error); 2567 2568 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 1); 2569 2570 vrele(nd.ni_vp); 2571 return (error); 2572 } 2573 2574 /* 2575 * Common routine to set ownership given a vnode. 2576 */ 2577 static int 2578 change_owner(vp, uid, gid, p, posix_semantics) 2579 struct vnode *vp; 2580 uid_t uid; 2581 gid_t gid; 2582 struct proc *p; 2583 int posix_semantics; 2584 { 2585 struct vattr vattr; 2586 mode_t newmode; 2587 int error; 2588 2589 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2590 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2591 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2592 goto out; 2593 2594 #define CHANGED(x) ((int)(x) != -1) 2595 newmode = vattr.va_mode; 2596 if (posix_semantics) { 2597 /* 2598 * POSIX/XPG semantics: if the caller is not the super-user, 2599 * clear set-user-id and set-group-id bits. Both POSIX and 2600 * the XPG consider the behaviour for calls by the super-user 2601 * implementation-defined; we leave the set-user-id and set- 2602 * group-id settings intact in that case. 2603 */ 2604 if (suser(p->p_ucred, NULL) != 0) 2605 newmode &= ~(S_ISUID | S_ISGID); 2606 } else { 2607 /* 2608 * NetBSD semantics: when changing owner and/or group, 2609 * clear the respective bit(s). 2610 */ 2611 if (CHANGED(uid)) 2612 newmode &= ~S_ISUID; 2613 if (CHANGED(gid)) 2614 newmode &= ~S_ISGID; 2615 } 2616 /* Update va_mode iff altered. */ 2617 if (vattr.va_mode == newmode) 2618 newmode = VNOVAL; 2619 2620 VATTR_NULL(&vattr); 2621 vattr.va_uid = CHANGED(uid) ? uid : (uid_t)VNOVAL; 2622 vattr.va_gid = CHANGED(gid) ? gid : (gid_t)VNOVAL; 2623 vattr.va_mode = newmode; 2624 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2625 #undef CHANGED 2626 2627 out: 2628 VOP_UNLOCK(vp, 0); 2629 return (error); 2630 } 2631 2632 /* 2633 * Set the access and modification times given a path name; this 2634 * version follows links. 2635 */ 2636 /* ARGSUSED */ 2637 int 2638 sys_utimes(l, v, retval) 2639 struct lwp *l; 2640 void *v; 2641 register_t *retval; 2642 { 2643 struct sys_utimes_args /* { 2644 syscallarg(const char *) path; 2645 syscallarg(const struct timeval *) tptr; 2646 } */ *uap = v; 2647 struct proc *p = l->l_proc; 2648 int error; 2649 struct nameidata nd; 2650 2651 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2652 if ((error = namei(&nd)) != 0) 2653 return (error); 2654 2655 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 2656 2657 vrele(nd.ni_vp); 2658 return (error); 2659 } 2660 2661 /* 2662 * Set the access and modification times given a file descriptor. 2663 */ 2664 /* ARGSUSED */ 2665 int 2666 sys_futimes(l, v, retval) 2667 struct lwp *l; 2668 void *v; 2669 register_t *retval; 2670 { 2671 struct sys_futimes_args /* { 2672 syscallarg(int) fd; 2673 syscallarg(const struct timeval *) tptr; 2674 } */ *uap = v; 2675 struct proc *p = l->l_proc; 2676 int error; 2677 struct file *fp; 2678 2679 /* getvnode() will use the descriptor for us */ 2680 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2681 return (error); 2682 2683 error = change_utimes((struct vnode *)fp->f_data, SCARG(uap, tptr), p); 2684 FILE_UNUSE(fp, p); 2685 return (error); 2686 } 2687 2688 /* 2689 * Set the access and modification times given a path name; this 2690 * version does not follow links. 2691 */ 2692 /* ARGSUSED */ 2693 int 2694 sys_lutimes(l, v, retval) 2695 struct lwp *l; 2696 void *v; 2697 register_t *retval; 2698 { 2699 struct sys_lutimes_args /* { 2700 syscallarg(const char *) path; 2701 syscallarg(const struct timeval *) tptr; 2702 } */ *uap = v; 2703 struct proc *p = l->l_proc; 2704 int error; 2705 struct nameidata nd; 2706 2707 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2708 if ((error = namei(&nd)) != 0) 2709 return (error); 2710 2711 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 2712 2713 vrele(nd.ni_vp); 2714 return (error); 2715 } 2716 2717 /* 2718 * Common routine to set access and modification times given a vnode. 2719 */ 2720 static int 2721 change_utimes(vp, tptr, p) 2722 struct vnode *vp; 2723 const struct timeval *tptr; 2724 struct proc *p; 2725 { 2726 struct timeval tv[2]; 2727 struct vattr vattr; 2728 int error; 2729 2730 VATTR_NULL(&vattr); 2731 if (tptr == NULL) { 2732 microtime(&tv[0]); 2733 tv[1] = tv[0]; 2734 vattr.va_vaflags |= VA_UTIMES_NULL; 2735 } else { 2736 error = copyin(tptr, tv, sizeof(tv)); 2737 if (error) 2738 return (error); 2739 } 2740 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2741 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2742 vattr.va_atime.tv_sec = tv[0].tv_sec; 2743 vattr.va_atime.tv_nsec = tv[0].tv_usec * 1000; 2744 vattr.va_mtime.tv_sec = tv[1].tv_sec; 2745 vattr.va_mtime.tv_nsec = tv[1].tv_usec * 1000; 2746 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2747 VOP_UNLOCK(vp, 0); 2748 return (error); 2749 } 2750 2751 /* 2752 * Truncate a file given its path name. 2753 */ 2754 /* ARGSUSED */ 2755 int 2756 sys_truncate(l, v, retval) 2757 struct lwp *l; 2758 void *v; 2759 register_t *retval; 2760 { 2761 struct sys_truncate_args /* { 2762 syscallarg(const char *) path; 2763 syscallarg(int) pad; 2764 syscallarg(off_t) length; 2765 } */ *uap = v; 2766 struct proc *p = l->l_proc; 2767 struct vnode *vp; 2768 struct vattr vattr; 2769 int error; 2770 struct nameidata nd; 2771 2772 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2773 if ((error = namei(&nd)) != 0) 2774 return (error); 2775 vp = nd.ni_vp; 2776 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2777 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2778 if (vp->v_type == VDIR) 2779 error = EISDIR; 2780 else if ((error = vn_writechk(vp)) == 0 && 2781 (error = VOP_ACCESS(vp, VWRITE, p->p_ucred, p)) == 0) { 2782 VATTR_NULL(&vattr); 2783 vattr.va_size = SCARG(uap, length); 2784 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2785 } 2786 vput(vp); 2787 return (error); 2788 } 2789 2790 /* 2791 * Truncate a file given a file descriptor. 2792 */ 2793 /* ARGSUSED */ 2794 int 2795 sys_ftruncate(l, v, retval) 2796 struct lwp *l; 2797 void *v; 2798 register_t *retval; 2799 { 2800 struct sys_ftruncate_args /* { 2801 syscallarg(int) fd; 2802 syscallarg(int) pad; 2803 syscallarg(off_t) length; 2804 } */ *uap = v; 2805 struct proc *p = l->l_proc; 2806 struct vattr vattr; 2807 struct vnode *vp; 2808 struct file *fp; 2809 int error; 2810 2811 /* getvnode() will use the descriptor for us */ 2812 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2813 return (error); 2814 if ((fp->f_flag & FWRITE) == 0) { 2815 error = EINVAL; 2816 goto out; 2817 } 2818 vp = (struct vnode *)fp->f_data; 2819 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2820 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2821 if (vp->v_type == VDIR) 2822 error = EISDIR; 2823 else if ((error = vn_writechk(vp)) == 0) { 2824 VATTR_NULL(&vattr); 2825 vattr.va_size = SCARG(uap, length); 2826 error = VOP_SETATTR(vp, &vattr, fp->f_cred, p); 2827 } 2828 VOP_UNLOCK(vp, 0); 2829 out: 2830 FILE_UNUSE(fp, p); 2831 return (error); 2832 } 2833 2834 /* 2835 * Sync an open file. 2836 */ 2837 /* ARGSUSED */ 2838 int 2839 sys_fsync(l, v, retval) 2840 struct lwp *l; 2841 void *v; 2842 register_t *retval; 2843 { 2844 struct sys_fsync_args /* { 2845 syscallarg(int) fd; 2846 } */ *uap = v; 2847 struct proc *p = l->l_proc; 2848 struct vnode *vp; 2849 struct file *fp; 2850 int error; 2851 2852 /* getvnode() will use the descriptor for us */ 2853 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2854 return (error); 2855 vp = (struct vnode *)fp->f_data; 2856 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2857 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT, 0, 0, p); 2858 if (error == 0 && bioops.io_fsync != NULL && 2859 vp->v_mount && (vp->v_mount->mnt_flag & MNT_SOFTDEP)) 2860 (*bioops.io_fsync)(vp); 2861 VOP_UNLOCK(vp, 0); 2862 FILE_UNUSE(fp, p); 2863 return (error); 2864 } 2865 2866 /* 2867 * Sync the data of an open file. 2868 */ 2869 /* ARGSUSED */ 2870 int 2871 sys_fdatasync(l, v, retval) 2872 struct lwp *l; 2873 void *v; 2874 register_t *retval; 2875 { 2876 struct sys_fdatasync_args /* { 2877 syscallarg(int) fd; 2878 } */ *uap = v; 2879 struct proc *p = l->l_proc; 2880 struct vnode *vp; 2881 struct file *fp; 2882 int error; 2883 2884 /* getvnode() will use the descriptor for us */ 2885 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2886 return (error); 2887 vp = (struct vnode *)fp->f_data; 2888 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2889 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT|FSYNC_DATAONLY, 0, 0, p); 2890 VOP_UNLOCK(vp, 0); 2891 FILE_UNUSE(fp, p); 2892 return (error); 2893 } 2894 2895 /* 2896 * Rename files, (standard) BSD semantics frontend. 2897 */ 2898 /* ARGSUSED */ 2899 int 2900 sys_rename(l, v, retval) 2901 struct lwp *l; 2902 void *v; 2903 register_t *retval; 2904 { 2905 struct sys_rename_args /* { 2906 syscallarg(const char *) from; 2907 syscallarg(const char *) to; 2908 } */ *uap = v; 2909 struct proc *p = l->l_proc; 2910 2911 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 0)); 2912 } 2913 2914 /* 2915 * Rename files, POSIX semantics frontend. 2916 */ 2917 /* ARGSUSED */ 2918 int 2919 sys___posix_rename(l, v, retval) 2920 struct lwp *l; 2921 void *v; 2922 register_t *retval; 2923 { 2924 struct sys___posix_rename_args /* { 2925 syscallarg(const char *) from; 2926 syscallarg(const char *) to; 2927 } */ *uap = v; 2928 struct proc *p = l->l_proc; 2929 2930 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 1)); 2931 } 2932 2933 /* 2934 * Rename files. Source and destination must either both be directories, 2935 * or both not be directories. If target is a directory, it must be empty. 2936 * If `from' and `to' refer to the same object, the value of the `retain' 2937 * argument is used to determine whether `from' will be 2938 * 2939 * (retain == 0) deleted unless `from' and `to' refer to the same 2940 * object in the file system's name space (BSD). 2941 * (retain == 1) always retained (POSIX). 2942 */ 2943 static int 2944 rename_files(from, to, p, retain) 2945 const char *from, *to; 2946 struct proc *p; 2947 int retain; 2948 { 2949 struct vnode *tvp, *fvp, *tdvp; 2950 struct nameidata fromnd, tond; 2951 int error; 2952 2953 NDINIT(&fromnd, DELETE, WANTPARENT | SAVESTART, UIO_USERSPACE, 2954 from, p); 2955 if ((error = namei(&fromnd)) != 0) 2956 return (error); 2957 fvp = fromnd.ni_vp; 2958 NDINIT(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART, 2959 UIO_USERSPACE, to, p); 2960 if ((error = namei(&tond)) != 0) { 2961 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 2962 vrele(fromnd.ni_dvp); 2963 vrele(fvp); 2964 goto out1; 2965 } 2966 tdvp = tond.ni_dvp; 2967 tvp = tond.ni_vp; 2968 2969 if (tvp != NULL) { 2970 if (fvp->v_type == VDIR && tvp->v_type != VDIR) { 2971 error = ENOTDIR; 2972 goto out; 2973 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) { 2974 error = EISDIR; 2975 goto out; 2976 } 2977 } 2978 2979 if (fvp == tdvp) 2980 error = EINVAL; 2981 2982 /* 2983 * Source and destination refer to the same object. 2984 */ 2985 if (fvp == tvp) { 2986 if (retain) 2987 error = -1; 2988 else if (fromnd.ni_dvp == tdvp && 2989 fromnd.ni_cnd.cn_namelen == tond.ni_cnd.cn_namelen && 2990 !memcmp(fromnd.ni_cnd.cn_nameptr, 2991 tond.ni_cnd.cn_nameptr, 2992 fromnd.ni_cnd.cn_namelen)) 2993 error = -1; 2994 } 2995 2996 out: 2997 if (!error) { 2998 VOP_LEASE(tdvp, p, p->p_ucred, LEASE_WRITE); 2999 if (fromnd.ni_dvp != tdvp) 3000 VOP_LEASE(fromnd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 3001 if (tvp) { 3002 VOP_LEASE(tvp, p, p->p_ucred, LEASE_WRITE); 3003 } 3004 error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd, 3005 tond.ni_dvp, tond.ni_vp, &tond.ni_cnd); 3006 } else { 3007 VOP_ABORTOP(tond.ni_dvp, &tond.ni_cnd); 3008 if (tdvp == tvp) 3009 vrele(tdvp); 3010 else 3011 vput(tdvp); 3012 if (tvp) 3013 vput(tvp); 3014 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 3015 vrele(fromnd.ni_dvp); 3016 vrele(fvp); 3017 } 3018 vrele(tond.ni_startdir); 3019 PNBUF_PUT(tond.ni_cnd.cn_pnbuf); 3020 out1: 3021 if (fromnd.ni_startdir) 3022 vrele(fromnd.ni_startdir); 3023 PNBUF_PUT(fromnd.ni_cnd.cn_pnbuf); 3024 return (error == -1 ? 0 : error); 3025 } 3026 3027 /* 3028 * Make a directory file. 3029 */ 3030 /* ARGSUSED */ 3031 int 3032 sys_mkdir(l, v, retval) 3033 struct lwp *l; 3034 void *v; 3035 register_t *retval; 3036 { 3037 struct sys_mkdir_args /* { 3038 syscallarg(const char *) path; 3039 syscallarg(int) mode; 3040 } */ *uap = v; 3041 struct proc *p = l->l_proc; 3042 struct vnode *vp; 3043 struct vattr vattr; 3044 int error; 3045 struct nameidata nd; 3046 3047 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 3048 if ((error = namei(&nd)) != 0) 3049 return (error); 3050 vp = nd.ni_vp; 3051 if (vp != NULL) { 3052 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 3053 if (nd.ni_dvp == vp) 3054 vrele(nd.ni_dvp); 3055 else 3056 vput(nd.ni_dvp); 3057 vrele(vp); 3058 return (EEXIST); 3059 } 3060 VATTR_NULL(&vattr); 3061 vattr.va_type = VDIR; 3062 vattr.va_mode = 3063 (SCARG(uap, mode) & ACCESSPERMS) &~ p->p_cwdi->cwdi_cmask; 3064 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 3065 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 3066 if (!error) 3067 vput(nd.ni_vp); 3068 return (error); 3069 } 3070 3071 /* 3072 * Remove a directory file. 3073 */ 3074 /* ARGSUSED */ 3075 int 3076 sys_rmdir(l, v, retval) 3077 struct lwp *l; 3078 void *v; 3079 register_t *retval; 3080 { 3081 struct sys_rmdir_args /* { 3082 syscallarg(const char *) path; 3083 } */ *uap = v; 3084 struct proc *p = l->l_proc; 3085 struct vnode *vp; 3086 int error; 3087 struct nameidata nd; 3088 3089 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 3090 SCARG(uap, path), p); 3091 if ((error = namei(&nd)) != 0) 3092 return (error); 3093 vp = nd.ni_vp; 3094 if (vp->v_type != VDIR) { 3095 error = ENOTDIR; 3096 goto out; 3097 } 3098 /* 3099 * No rmdir "." please. 3100 */ 3101 if (nd.ni_dvp == vp) { 3102 error = EINVAL; 3103 goto out; 3104 } 3105 /* 3106 * The root of a mounted filesystem cannot be deleted. 3107 */ 3108 if (vp->v_flag & VROOT) 3109 error = EBUSY; 3110 out: 3111 if (!error) { 3112 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 3113 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 3114 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 3115 } else { 3116 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 3117 if (nd.ni_dvp == vp) 3118 vrele(nd.ni_dvp); 3119 else 3120 vput(nd.ni_dvp); 3121 vput(vp); 3122 } 3123 return (error); 3124 } 3125 3126 /* 3127 * Read a block of directory entries in a file system independent format. 3128 */ 3129 int 3130 sys_getdents(l, v, retval) 3131 struct lwp *l; 3132 void *v; 3133 register_t *retval; 3134 { 3135 struct sys_getdents_args /* { 3136 syscallarg(int) fd; 3137 syscallarg(char *) buf; 3138 syscallarg(size_t) count; 3139 } */ *uap = v; 3140 struct proc *p = l->l_proc; 3141 struct file *fp; 3142 int error, done; 3143 3144 /* getvnode() will use the descriptor for us */ 3145 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 3146 return (error); 3147 if ((fp->f_flag & FREAD) == 0) { 3148 error = EBADF; 3149 goto out; 3150 } 3151 error = vn_readdir(fp, SCARG(uap, buf), UIO_USERSPACE, 3152 SCARG(uap, count), &done, p, 0, 0); 3153 *retval = done; 3154 out: 3155 FILE_UNUSE(fp, p); 3156 return (error); 3157 } 3158 3159 /* 3160 * Set the mode mask for creation of filesystem nodes. 3161 */ 3162 int 3163 sys_umask(l, v, retval) 3164 struct lwp *l; 3165 void *v; 3166 register_t *retval; 3167 { 3168 struct sys_umask_args /* { 3169 syscallarg(mode_t) newmask; 3170 } */ *uap = v; 3171 struct proc *p = l->l_proc; 3172 struct cwdinfo *cwdi; 3173 3174 cwdi = p->p_cwdi; 3175 *retval = cwdi->cwdi_cmask; 3176 cwdi->cwdi_cmask = SCARG(uap, newmask) & ALLPERMS; 3177 return (0); 3178 } 3179 3180 /* 3181 * Void all references to file by ripping underlying filesystem 3182 * away from vnode. 3183 */ 3184 /* ARGSUSED */ 3185 int 3186 sys_revoke(l, v, retval) 3187 struct lwp *l; 3188 void *v; 3189 register_t *retval; 3190 { 3191 struct sys_revoke_args /* { 3192 syscallarg(const char *) path; 3193 } */ *uap = v; 3194 struct proc *p = l->l_proc; 3195 struct vnode *vp; 3196 struct vattr vattr; 3197 int error; 3198 struct nameidata nd; 3199 3200 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 3201 if ((error = namei(&nd)) != 0) 3202 return (error); 3203 vp = nd.ni_vp; 3204 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 3205 goto out; 3206 if (p->p_ucred->cr_uid != vattr.va_uid && 3207 (error = suser(p->p_ucred, &p->p_acflag)) != 0) 3208 goto out; 3209 if (vp->v_usecount > 1 || (vp->v_flag & (VALIASED | VLAYER))) 3210 VOP_REVOKE(vp, REVOKEALL); 3211 out: 3212 vrele(vp); 3213 return (error); 3214 } 3215 3216 /* 3217 * Convert a user file descriptor to a kernel file entry. 3218 */ 3219 int 3220 getvnode(fdp, fd, fpp) 3221 struct filedesc *fdp; 3222 int fd; 3223 struct file **fpp; 3224 { 3225 struct vnode *vp; 3226 struct file *fp; 3227 3228 if ((fp = fd_getfile(fdp, fd)) == NULL) 3229 return (EBADF); 3230 3231 FILE_USE(fp); 3232 3233 if (fp->f_type != DTYPE_VNODE) { 3234 FILE_UNUSE(fp, NULL); 3235 return (EINVAL); 3236 } 3237 3238 vp = (struct vnode *)fp->f_data; 3239 if (vp->v_type == VBAD) { 3240 FILE_UNUSE(fp, NULL); 3241 return (EBADF); 3242 } 3243 3244 *fpp = fp; 3245 return (0); 3246 } 3247
Indexes created Thu Sep 25 16:09:42 GMT 2025